“…The elliptic singularities were introduced by P. Wagreich in [24]; (X, p) is said to be elliptic if χ(Z) = 0. The theory of those singularities were developed by Wagreich [24], H. Laufer [8], S.S.-T. Yau [29], [30], [31], [32], M. Tomari [20], [21] and others. Laufer proved that Gorenstein singularities with p g = 1 are topologically characterized, and that for those singularities, mult = max{−Z 2 , 2} and emb dim = max{−Z 2 , 3}.Yau introduced the elliptic sequence, which is a topological invariant of an elliptic singularity, and obtained many results similar to those above, under certain conditions.…”